diff --git a/.travis.yml b/.travis.yml
index d6be4bf..4879884 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,6 +8,7 @@ node_js:
   - '10'
   - '8'
   - '6'
+install: yarn --frozen-lockfile --ignore-engines
 before_script:
   - curl -o- -L https://yarnpkg.com/install.sh | bash
   - export PATH="$HOME/.yarn/bin:$PATH"
@@ -15,4 +16,4 @@ script:
   - yarn test
 after_success:
   - bash <(curl -s https://codecov.io/bash) -f coverage/coverage-final.json
-  - yarn semantic-release
+  - 'if [[ "$TRAVIS_JOB_NUMBER" == *.1 ]]; then yarn semantic-release; fi'
diff --git a/package.json b/package.json
index 44ff710..13c7e72 100644
--- a/package.json
+++ b/package.json
@@ -17,7 +17,7 @@
     "url": "https://github.com/ariporad/pirates.git"
   },
   "engines": {
-    "node": ">= 4"
+    "node": ">= 6"
   },
   "author": {
     "name": "Ari Porad",